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• Natural dyes. Colours extracted from plants.

Use for: Elm blight

• A widespread fungoid killer of elms (Ulmus species) and certain other trees, first described in the Netherlands. Spread by bark beetles, the disease has decimated elm populations throughout much of Europe and North America.

• The yam family. Plants are herbaceous or woody vines and shrubs, distributed throughout tropical and warm temperate regions. Members of the family have thick, sometimes woody roots or tuber-like underground stems and net-veined, often heart-shaped leaves that sometimes are lobed. The small green or white flowers of most species are borne in clusters in the leaf axils. The fruit is a winged capsule or a berry.

Use for: yams

• A genus of mostly tropical twining herbs (family Dioscoreaceae) including the yams and having net-veined leaves and small dioecious flowers

Use for: larkspur

• A genus of herbaceous plants in the buttercup family (Ranunculaceae), many of which are grown for the floral industry and as ornamentals for their showy flower stalks.

• a branch of biology dealing with the structure, function, multiplication, pathology, and life history of cells

• a plant or plantlike organism (such as a fern, moss, alga, or fungus) reproducing by spores and not producing flowers or seed

• an armed police force organized on military lines but distinct from the regular army